2 * linux/drivers/net/am79c961.c
4 * by Russell King <rmk@arm.linux.org.uk> 1995-2000.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Derived from various things including skeleton.c
12 * This is a special driver for the am79c961A Lance chip used in the
13 * Intel (formally Digital Equipment Corp) EBSA110 platform.
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/types.h>
19 #include <linux/fcntl.h>
20 #include <linux/interrupt.h>
21 #include <linux/ptrace.h>
22 #include <linux/ioport.h>
24 #include <linux/malloc.h>
25 #include <linux/string.h>
26 #include <linux/errno.h>
27 #include <linux/netdevice.h>
28 #include <linux/etherdevice.h>
29 #include <linux/skbuff.h>
30 #include <linux/delay.h>
31 #include <linux/init.h>
33 #include <asm/system.h>
34 #include <asm/bitops.h>
38 #include <asm/ecard.h>
43 #include "am79c961a.h"
45 static void am79c961_interrupt (int irq, void *dev_id, struct pt_regs *regs);
47 static unsigned int net_debug = NET_DEBUG;
49 static char *version = "am79c961 ethernet driver (c) 1995 R.M.King v0.02\n";
51 /* --------------------------------------------------------------------------- */
55 write_rreg (unsigned long base, unsigned int reg, unsigned short val)
57 __asm__("str%?h %1, [%2] @ NET_RAP
58 str%?h %0, [%2, #-4] @ NET_RDP
59 " : : "r" (val), "r" (reg), "r" (0xf0000464));
62 static inline unsigned short
63 read_rreg (unsigned int base_addr, unsigned int reg)
66 __asm__("str%?h %1, [%2] @ NET_RAP
67 ldr%?h %0, [%2, #-4] @ NET_RDP
68 " : "=r" (v): "r" (reg), "r" (0xf0000464));
73 write_ireg (unsigned long base, unsigned int reg, unsigned short val)
75 __asm__("str%?h %1, [%2] @ NET_RAP
76 str%?h %0, [%2, #8] @ NET_IDP
77 " : : "r" (val), "r" (reg), "r" (0xf0000464));
80 #define am_writeword(dev,off,val)\
81 __asm__("str%?h %0, [%1]" : : \
82 "r" ((val) & 0xffff), "r" (0xe0000000 + ((off) << 1)));
85 am_writebuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
87 offset = 0xe0000000 + (offset << 1);
88 length = (length + 1) & ~1;
90 __asm__ __volatile__("str%?h %2, [%0], #4"
91 : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
96 unsigned int tmp, tmp2;
97 __asm__ __volatile__("
100 mov%? %2, %2, lsr #16
103 mov%? %3, %3, lsr #16
105 " : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2)
106 : "0" (offset), "1" (buf));
110 __asm__ __volatile__("str%?h %2, [%0], #4"
111 : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
118 * This reads a 16-bit quantity in little-endian
119 * mode from the am79c961 buffer.
121 static inline unsigned short am_readword(struct net_device *dev, u_int off)
123 unsigned long address = 0xe0000000 + (off << 1);
126 __asm__("ldr%?h %0, [%1]" : "=r" (val): "r" (address));
131 am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
133 offset = 0xe0000000 + (offset << 1);
134 length = (length + 1) & ~1;
137 __asm__ __volatile__("
142 " : "=&r" (offset), "=&r" (buf), "=r" (tmp): "0" (offset), "1" (buf));
146 unsigned int tmp, tmp2, tmp3;
147 __asm__ __volatile__("
150 orr%? %2, %2, %3, lsl #16
153 orr%? %3, %3, %4, lsl #16
154 stm%?ia %1!, {%2, %3}
155 " : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2), "=r" (tmp3)
156 : "0" (offset), "1" (buf));
161 __asm__ __volatile__("
166 " : "=&r" (offset), "=&r" (buf), "=r" (tmp) : "0" (offset), "1" (buf));
171 #error Not compatable
175 am79c961_ramtest(struct net_device *dev, unsigned int val)
177 unsigned char *buffer = kmalloc (65536, GFP_KERNEL);
178 int i, error = 0, errorcount = 0;
182 memset (buffer, val, 65536);
183 am_writebuffer(dev, 0, buffer, 65536);
184 memset (buffer, val ^ 255, 65536);
185 am_readbuffer(dev, 0, buffer, 65536);
186 for (i = 0; i < 65536; i++) {
187 if (buffer[i] != val && !error) {
188 printk ("%s: buffer error (%02X %02X) %05X - ", dev->name, val, buffer[i], i);
191 } else if (error && buffer[i] == val) {
192 printk ("%05X\n", i);
203 am79c961_init_for_open(struct net_device *dev)
205 struct dev_priv *priv = (struct dev_priv *)dev->priv;
208 u_int hdr_addr, first_free_addr;
214 spin_lock_irqsave(priv->chip_lock, flags);
215 write_rreg (dev->base_addr, CSR0, CSR0_BABL|CSR0_CERR|CSR0_MISS|CSR0_MERR|CSR0_TINT|CSR0_RINT|CSR0_STOP);
216 spin_unlock_irqrestore(priv->chip_lock, flags);
218 write_ireg (dev->base_addr, 5, 0x00a0); /* Receive address LED */
219 write_ireg (dev->base_addr, 6, 0x0081); /* Collision LED */
220 write_ireg (dev->base_addr, 7, 0x0090); /* XMIT LED */
221 write_ireg (dev->base_addr, 2, 0x0000); /* MODE register selects media */
223 for (i = LADRL; i <= LADRH; i++)
224 write_rreg (dev->base_addr, i, 0);
226 for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2)
227 write_rreg (dev->base_addr, i, p[0] | (p[1] << 8));
230 if (dev->flags & IFF_PROMISC)
233 write_rreg (dev->base_addr, MODE, i);
234 write_rreg (dev->base_addr, POLLINT, 0);
235 write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS);
236 write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS);
238 first_free_addr = RX_BUFFERS * 8 + TX_BUFFERS * 8 + 16;
243 priv->rxhdr = hdr_addr;
245 for (i = 0; i < RX_BUFFERS; i++) {
246 priv->rxbuffer[i] = first_free_addr;
247 am_writeword (dev, hdr_addr, first_free_addr);
248 am_writeword (dev, hdr_addr + 2, RMD_OWN);
249 am_writeword (dev, hdr_addr + 4, (-1600));
250 am_writeword (dev, hdr_addr + 6, 0);
251 first_free_addr += 1600;
256 priv->txhdr = hdr_addr;
257 for (i = 0; i < TX_BUFFERS; i++) {
258 priv->txbuffer[i] = first_free_addr;
259 am_writeword (dev, hdr_addr, first_free_addr);
260 am_writeword (dev, hdr_addr + 2, TMD_STP|TMD_ENP);
261 am_writeword (dev, hdr_addr + 4, 0xf000);
262 am_writeword (dev, hdr_addr + 6, 0);
263 first_free_addr += 1600;
267 write_rreg (dev->base_addr, BASERXL, priv->rxhdr);
268 write_rreg (dev->base_addr, BASERXH, 0);
269 write_rreg (dev->base_addr, BASETXL, priv->txhdr);
270 write_rreg (dev->base_addr, BASERXH, 0);
271 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
272 write_rreg (dev->base_addr, CSR3, CSR3_IDONM|CSR3_BABLM|CSR3_DXSUFLO);
273 write_rreg (dev->base_addr, CSR0, CSR0_IENA|CSR0_STRT);
277 * Open/initialize the board. This is called (in the current kernel)
278 * sometime after booting when the 'ifconfig' program is run.
280 * This routine should set everything up anew at each open, even
281 * registers that "should" only need to be set once at boot, so that
282 * there is non-reboot way to recover if something goes wrong.
285 am79c961_open(struct net_device *dev)
287 struct dev_priv *priv = (struct dev_priv *)dev->priv;
290 memset (&priv->stats, 0, sizeof (priv->stats));
292 ret = request_irq(dev->irq, am79c961_interrupt, 0, dev->name, dev);
296 am79c961_init_for_open(dev);
298 netif_start_queue(dev);
304 * The inverse routine to am79c961_open().
307 am79c961_close(struct net_device *dev)
309 struct dev_priv *priv = (struct dev_priv *)dev->priv;
312 netif_stop_queue(dev);
314 spin_lock_irqsave(priv->chip_lock, flags);
315 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
316 write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
317 spin_unlock_irqrestore(priv->chip_lock, flags);
319 free_irq (dev->irq, dev);
325 * Get the current statistics. This may be called with the card open or
328 static struct net_device_stats *am79c961_getstats (struct net_device *dev)
330 struct dev_priv *priv = (struct dev_priv *)dev->priv;
334 static inline u32 update_crc(u32 crc, u8 byte)
338 for (i = 8; i != 0; i--) {
351 static void am79c961_mc_hash(struct dev_mc_list *dmi, unsigned short *hash)
353 if (dmi->dmi_addrlen == ETH_ALEN && dmi->dmi_addr[0] & 0x01) {
359 for (i = 0; i < ETH_ALEN; i++)
360 crc = update_crc(crc, dmi->dmi_addr[i]);
363 bit = (crc >> 26) & 15;
365 hash[idx] |= 1 << bit;
370 * Set or clear promiscuous/multicast mode filter for this adaptor.
372 static void am79c961_setmulticastlist (struct net_device *dev)
374 struct dev_priv *priv = (struct dev_priv *)dev->priv;
376 unsigned short multi_hash[4], mode;
379 mode = MODE_PORT_10BT;
381 if (dev->flags & IFF_PROMISC) {
382 mode |= MODE_PROMISC;
383 } else if (dev->flags & IFF_ALLMULTI) {
384 memset(multi_hash, 0xff, sizeof(multi_hash));
386 struct dev_mc_list *dmi;
388 memset(multi_hash, 0x00, sizeof(multi_hash));
390 for (dmi = dev->mc_list; dmi; dmi = dmi->next)
391 am79c961_mc_hash(dmi, multi_hash);
394 spin_lock_irqsave(priv->chip_lock, flags);
396 stopped = read_rreg(dev->base_addr, CSR0) & CSR0_STOP;
400 * Put the chip into suspend mode
402 write_rreg(dev->base_addr, CTRL1, CTRL1_SPND);
405 * Spin waiting for chip to report suspend mode
407 while ((read_rreg(dev->base_addr, CTRL1) & CTRL1_SPND) == 0) {
408 spin_unlock_irqrestore(priv->chip_lock, flags);
410 spin_lock_irqsave(priv->chip_lock, flags);
415 * Update the multicast hash table
417 for (i = 0; i < sizeof(multi_hash) / sizeof(multi_hash[0]); i++)
418 write_rreg(dev->base_addr, i + LADRL, multi_hash[i]);
421 * Write the mode register
423 write_rreg(dev->base_addr, MODE, mode);
427 * Put the chip back into running mode
429 write_rreg(dev->base_addr, CTRL1, 0);
432 spin_unlock_irqrestore(priv->chip_lock, flags);
435 static void am79c961_timeout(struct net_device *dev)
437 printk(KERN_WARNING "%s: transmit timed out, network cable problem?\n",
441 * ought to do some setup of the tx side here
444 netif_wake_queue(dev);
451 am79c961_sendpacket(struct sk_buff *skb, struct net_device *dev)
453 struct dev_priv *priv = (struct dev_priv *)dev->priv;
454 unsigned int length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
455 unsigned int hdraddr, bufaddr;
460 hdraddr = priv->txhdr + (head << 3);
461 bufaddr = priv->txbuffer[head];
463 if (head >= TX_BUFFERS)
466 am_writebuffer (dev, bufaddr, skb->data, length);
467 am_writeword (dev, hdraddr + 4, -length);
468 am_writeword (dev, hdraddr + 2, TMD_OWN|TMD_STP|TMD_ENP);
471 spin_lock_irqsave(priv->chip_lock, flags);
472 write_rreg (dev->base_addr, CSR0, CSR0_TDMD|CSR0_IENA);
473 dev->trans_start = jiffies;
474 spin_unlock_irqrestore(priv->chip_lock, flags);
477 * If the next packet is owned by the ethernet device,
478 * then the tx ring is full and we can't add another
481 if (am_readword(dev, priv->txhdr + (priv->txhead << 3) + 2) & TMD_OWN) {
482 printk(KERN_DEBUG"tx ring full, stopping queue\n");
483 netif_stop_queue(dev);
492 * If we have a good packet(s), get it/them out of the buffers.
495 am79c961_rx(struct net_device *dev, struct dev_priv *priv)
504 hdraddr = priv->rxhdr + (priv->rxtail << 3);
505 pktaddr = priv->rxbuffer[priv->rxtail];
507 status = am_readword (dev, hdraddr + 2);
508 if (status & RMD_OWN) /* do we own it? */
512 if (priv->rxtail >= RX_BUFFERS)
515 if ((status & (RMD_ERR|RMD_STP|RMD_ENP)) != (RMD_STP|RMD_ENP)) {
516 am_writeword (dev, hdraddr + 2, RMD_OWN);
517 priv->stats.rx_errors ++;
518 if (status & RMD_ERR) {
519 if (status & RMD_FRAM)
520 priv->stats.rx_frame_errors ++;
521 if (status & RMD_CRC)
522 priv->stats.rx_crc_errors ++;
523 } else if (status & RMD_STP)
524 priv->stats.rx_length_errors ++;
528 len = am_readword(dev, hdraddr + 6);
529 skb = dev_alloc_skb(len + 2);
535 am_readbuffer(dev, pktaddr, skb_put(skb, len), len);
536 am_writeword(dev, hdraddr + 2, RMD_OWN);
537 skb->protocol = eth_type_trans(skb, dev);
539 dev->last_rx = jiffies;
540 priv->stats.rx_bytes += len;
541 priv->stats.rx_packets ++;
543 am_writeword (dev, hdraddr + 2, RMD_OWN);
544 printk (KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name);
545 priv->stats.rx_dropped ++;
552 * Update stats for the transmitted packet
555 am79c961_tx(struct net_device *dev, struct dev_priv *priv)
562 bufnum = priv->txtail;
563 hdraddr = priv->txhdr + (priv->txtail << 3);
564 status = am_readword (dev, hdraddr + 2);
565 if (status & TMD_OWN)
569 if (priv->txtail >= TX_BUFFERS)
572 if (status & TMD_ERR) {
575 priv->stats.tx_errors ++;
577 status2 = am_readword (dev, hdraddr + 6);
580 * Clear the error byte
582 am_writeword (dev, hdraddr + 6, 0);
584 if (status2 & TST_RTRY)
585 priv->stats.collisions += 16;
586 if (status2 & TST_LCOL)
587 priv->stats.tx_window_errors ++;
588 if (status2 & TST_LCAR)
589 priv->stats.tx_carrier_errors ++;
590 if (status2 & TST_UFLO)
591 priv->stats.tx_fifo_errors ++;
594 priv->stats.tx_packets ++;
595 } while (priv->txtail != priv->txhead);
597 netif_wake_queue(dev);
601 am79c961_interrupt(int irq, void *dev_id, struct pt_regs *regs)
603 struct net_device *dev = (struct net_device *)dev_id;
604 struct dev_priv *priv = (struct dev_priv *)dev->priv;
607 status = read_rreg(dev->base_addr, CSR0);
608 write_rreg(dev->base_addr, CSR0, status & (CSR0_TINT|CSR0_RINT|CSR0_MISS|CSR0_IENA));
610 if (status & CSR0_RINT)
611 am79c961_rx(dev, priv);
612 if (status & CSR0_TINT)
613 am79c961_tx(dev, priv);
614 if (status & CSR0_MISS)
615 priv->stats.rx_dropped ++;
619 * Initialise the chip. Note that we always expect
620 * to be entered with interrupts enabled.
623 am79c961_hw_init(struct net_device *dev)
625 struct dev_priv *priv = (struct dev_priv *)dev->priv;
627 spin_lock_irq(priv->chip_lock);
628 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
629 write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
630 spin_unlock_irq(priv->chip_lock);
632 am79c961_ramtest(dev, 0x66);
633 am79c961_ramtest(dev, 0x99);
638 static void __init am79c961_banner(void)
640 static unsigned version_printed = 0;
642 if (net_debug && version_printed++ == 0)
643 printk(KERN_INFO "%s", version);
646 static int __init am79c961_init(void)
648 struct net_device *dev;
649 struct dev_priv *priv;
652 dev = init_etherdev(NULL, sizeof(struct dev_priv));
657 SET_MODULE_OWNER(dev);
661 * Fixed address and IRQ lines here.
662 * The PNP initialisation should have been
663 * done by the ether bootp loader.
665 dev->base_addr = 0x220;
666 dev->irq = IRQ_EBSA110_ETHERNET;
671 inb((dev->base_addr + NET_RESET) >> 1);
675 * Check the manufacturer part of the
679 if (inb(dev->base_addr >> 1) != 0x08 ||
680 inb((dev->base_addr >> 1) + 1) != 00 ||
681 inb((dev->base_addr >> 1) + 2) != 0x2b)
684 if (!request_region(dev->base_addr, 0x18, dev->name))
688 printk(KERN_INFO "%s: am79c961 found at %08lx, IRQ%d, ether address ",
689 dev->name, dev->base_addr, dev->irq);
691 /* Retrive and print the ethernet address. */
692 for (i = 0; i < 6; i++) {
693 dev->dev_addr[i] = inb((dev->base_addr >> 1) + i) & 0xff;
694 printk (i == 5 ? "%02x\n" : "%02x:", dev->dev_addr[i]);
697 if (am79c961_hw_init(dev))
700 dev->open = am79c961_open;
701 dev->stop = am79c961_close;
702 dev->hard_start_xmit = am79c961_sendpacket;
703 dev->get_stats = am79c961_getstats;
704 dev->set_multicast_list = am79c961_setmulticastlist;
705 dev->tx_timeout = am79c961_timeout;
710 release_region(dev->base_addr, 0x18);
712 unregister_netdev(dev);
718 module_init(am79c961_init);